General Relativity and Quantum Cosmology

Title:Interpolating Between Topologies: Casimir Energies

Abstract: A set of models is considered which, in a certain sense, interpolates between
1+1 free quantum field theories on topologically distinct backgrounds. The
intermediate models may be termed free quantum field theories, though they are
certainly not local. Their ground state energies are computed and shown to be
finite. The possible relevance to changing spacetime topologies is discussed.